Vehicle Asset fee increase

i have been trying to find out why my vehicle installment increased by R600 while i am under debt review on a fixed amount with no prior notification. they have my details BUT the 24 hour response time that they are saying is now standing on 528 hours since my first email, they are the absolute worst bank to deal with and my previous query took 93 days!!! even the complaints dept are not responding, i can honestly not wait to get the vehicle paid off and i then do not have to deal with Standard Bank ever again, in fact if they are the only bank offering vehicle loans i would rather walk.